Bulletin of the Korean Chemical Society

  • 제33권6호
  • /
  • Pages.1845-1850
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  • 2012
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Layered Metal Hydroxides Containing Calcium and Their Structural Analysis

  • Kim, Tae-Hyun (Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University) ;
  • Heo, Il (Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University) ;
  • Paek, Seung-Min (Department of Chemistry, Kyungpook National University) ;
  • Park, Chung-Berm (National Institute of Horticultural & Herbal Science (NIHHS) of RDA) ;
  • Choi, Ae-Jin (National Institute of Horticultural & Herbal Science (NIHHS) of RDA) ;
  • Lee, Sung-Han (Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University) ;
  • Choy, Jin-Ho (Center for Intelligent Nano Bio Materials (CINBM), Department of Bio Inspired Science and Department of Chemistry and Nano Science, Ewha Womans University) ;
  • Oh, Jae-Min (Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei University)
  • 투고 : 2011.11.15
  • 심사 : 2012.02.28
  • 발행 : 2012.06.20
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초록

Layered metal hydroxides (LMHs) containing calcium were synthesized by coprecipitation in solution having two different trivalent metal ions, iron and aluminum. Two mixed metal solutions ($Ca^{2+}/Al^{3+}$ and $Ca^{2+}/Fe^{3+}$ = 2/1) were added to sodium hydroxide solution and the final pH was adjusted to ~11.5 and ~13 for CaAl-and CaFe-LMHs. Powder X-ray diffraction (XRD) for the two LMH samples showed well developed ($00l$) diffractions indicating 2-dimensional crystal structure of the synthesized LMHs. Rietveld refinement of the X-ray diffraction pattern, the local structure analysis through X-ray absorption spectroscopy, and thermal analysis also confirmed that the synthesized precipitates show typical structure of LMHs. The chemical formulae, $Ca_{2.04}Al_1(OH)_6(NO_3){\cdot}5.25H_2O$ and $Ca_{2.01}Fe_1(OH)_6(NO_3){\cdot}4.75H_2O$ were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Particle morphology and thermal behavior for the synthesized LMHs were examined by field emission scanning electron microscopy and thermogravimetricdifferential scanning calorimetry.

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